Johnhav430

Never noticed until today, when there is an issue with fogging up (67F outside with 95% humidity), that there are vertical squiggly lines on the glass, as if in-between the glass, not on the outside or inside? My wife's car has this as well. The only thing I can think of in common is that both vehicles have the so-called acoustic laminated glass? I did hear the LS has some sort of Rain X'ish treatment, but then again that would be on the outside, not internal to the glass....

edit p.s. my glass has the Lexus logo, my wife's is OE as well, so not aftermarket, google seems to lead to heated glass and Prius....

Jkallinen

Lamination process in manufacturing. Only visible when viewed at a certain angle.

Johnhav430

Interesting....are they more prevalent on acoustic types of glass? I would also wonder if it gets more obvious with age, but my wife's were noticeable when the car was brand new.....the LS is obviously 12 y.o.....(no way to tell how old the glass is but I assume original..)

jayclapp

I think the term "acoustic glass" is a bit of a misnomer. All auto windshields are laminated glass as required for safety reasons, and have been for almost forever. Laminated glass is made of two layers of glass with glue between them. Lexus chose to use laminated glass in all four doors on the UL (and the model below it) because the double layer reduced noise (hence the term acoustic).

Johnhav430

https://glassmagazine.com/article/au...iet-revolution

It says there is a 2-3 db reduction in noise.....3 db is a lot if we go back to physics, and remember that it takes double the amplifier power to increase volume by 3 db....